Portable electronic apparatus having a battery pack receptacle

ABSTRACT

The portable electronic apparatus has a box-like casing having a peripheral wall, and a pack receptacle defined within the casing. The pack receptacle has an opening portion opened in the peripheral wall. A packaged functional component is stored in the pack receptacle, such that the functional component can be detached therefrom through the opening portion. The pack receptacle of the casing is provided with a locking member for holding the functional component. The locking member is movable by manual operation between a locked position where the locking member is hooked on the functional component and a lock-released position where the locking member leaves the functional component. The pack receptacle is provided with a spring for energizing the functional component in the direction in which the functional component is pushed out through the opening portion. The opening portion of the casing and the locking member are covered with a detachable cover.

This is a divisional application of application Ser. No. 08/968,924, nowU.S. Pat. No. 5,905,632, filed on Nov. 6, 1997, which is a continuationof 08/615,439, filed on Mar. 14, 1996 (abandoned).

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a portable electronic apparatus such asa portable computer of book-type, and particularly, to a structure forallowing a battery pack or a CD-ROM drive device to be detachablycontained in a casing of the electronic apparatus.

2. Description of the Related Art

In recent years, various portable computers have been provided which areeasy to bring about and attain high functional performance. This kind ofcomputers have a box-like casing with a keyboard. The casing internallycontains various functional components such as a hard-disc drive device,a floppy disc drive device, and the likes.

This kind of computer comprises a battery pack which functions as adrive power source so that the it can be used where a commercialalternating current power source is not available. The battery pack isdetachably supported in the casing of the computer. This battery pack isdetached from the casing at a relatively high frequency, in comparisonwith the functional components such as the hard-disc drive device andthe floppy disc drive device. In this respect, there has been a knowcomputer in which a battery receptacle for containing the battery packis formed at a bottom portion of the casing. This battery receptacle isopen in the bottom wall of the casing or in front and side wallscontinuously extending from the bottom wall, so that the battery packcan easily be attached there to or detached therefrom, withoutdisassembling the casing.

However, in a computer whose battery receptacle is open in the bottomwall of the casing, a heavy and large battery pack is installed andpulled out through the bottom side of the casing. Therefore, when thebattery pack is installed into and extracted from the batteryreceptacle, the battery pack cannot be supported by the casing, and mayunintentionally fall therefrom. Then, the battery pack falls down on theground or floor, causing such an impact which damages the battery pack.

As a manner of solving this problem, it has been considered that thecasing is place up side down to make the bottom wall of the casing faceupwardly, when the battery pack is pulled out of the battery receptacle.In this manner, since the battery receptacle is open upwardly, the heavybattery pack can be supported from the lower side by the casing, and theheavy battery pack can be prevented from falling unintentionally.

However, in this manner, when the battery pack is pulled out of thebattery receptacle, it is necessary for a user to carry out atroublesome service that a user must hook his or her finger on the heavybattery pack and pull up the pack. Thus, detachment of the battery packcauses a difficulty.

On the other hand, down-sizing of the casing has been promoted withrespect to a computer in recent days, in order to improve itsportability. Therefore, a number of functional components including thebattery pack, the hard-disc drive device, the floppy disc drive device,and the likes are arranged in the casing at a high density. Thesefunctional components are each packaged in modules each having aspecialized function. Further, these functional components aredetachably supported in the casing, so that they can be respectivelyreplaced with components of higher abilities.

However, in several kinds of computers, a plurality of functionalcomponents must be layered on each other in the thickness direction, inview of the internal space of the casing. If the functional componentsare thus layered on each other, a plurality of opening portions forinserting and exerting the functional components must be formed in thebottom and side walls of the casing, and therefore, the shape of thecasing is complicated. In addition, covers are required for respectivelycovering the opening portions of the casing, and the components of thecasing are increased in number by the covers thus added. Therefore,manufacturing costs are increased, and as a result, the price of thecomputer is increased.

SUMMARY OF THE INVENTION

The present invention has a first object of providing a portable typeelectronic apparatus which prevents a functional component fromunintentionally falling when a functional component such as a batterypack is detached from a casing, and which facilitates a service forpulling out the functional component.

The present invention has a second object of providing a portable typeelectronic apparatus in which first and second functional componentsarranged on each other can be inserted into and extracted from a packreceptacle through one single opening portion and which thus simplifiesthe structure of the casing.

In order to achieve the first object, the portable electronic apparatusaccording to the present invention comprises: a casing having a box-likeshape and a peripheral wall; a pack receptacle defined within thecasing, said pack receptacle having an opening portion open in theperipheral wall; a packaged functional component, stored in the packreceptacle such that the packaged functional component can be detachedthrough the opening portion; locking means positioned in the packreceptacle, for holding the functional component in the pack receptacle,said locking means being movable by manual operation between a lockedposition where the locking means is hooked on the functional componentand a lock-released position where the locking means leaves thefunctional component; pressure means provided in the pack receptacle,for energizing the functional component in a direction in which thefunctional component is pushed out of the opening portion; and a coverdetachably supported on the casing, for covering the opening portion andthe locking means.

In this structure, when the functional component is detached from thepack receptacle, the cover is detached from the casing, at first,thereby to expose the locking means and the opening portion. In thisstate, the functional component is still held in the casing by thelocking means, and therefore, the functional component does not fallfrom the pack receptacle.

In the next, the locking means is operated to move from the lockedposition to the lock-released position, thereby to make the lockingmeans leave the functional component. The locking of the functionalcomponent is thereby released. Since the functional component is pressedagainst the opening portion by the pressure means, and therefore, thefunctional component is pushed out of the opening portion when thelocking of the functional component is released by the locking means.Therefore, even when the functional component is detached with theopening portion oriented upwardly, the functional component pushed outof the opening portion can be easily caught by hands. Accordingly, acomplicated operation of pulling out the functional component withfingers hooked on the component is not necessary any more, and thefunctional component can be detached from the pack receptacle withimproved operation ability.

In addition, since the locking means is provided in the pack receptacle,the functional component can be supported by the same hand as used foroperating the locking means. Therefore, it is possible to prevent thefunctional component from unintentionally falling from the packreceptacle when the locking of the functional component is released, andthus, excellent operation ability is attained when the functionalcomponent is detached from the pack receptacle.

Further, since the cover hides the locking means, the locking meanscannot be operated to move toward the lock-released position from thelocked position as long as the cover is not detached. Therefore, it ispossible to prevent the locking of the functional component from beingunintentionally released.

In order to achieve the second object, the portable electronic apparatusaccording to the present invention comprises: a box-like casingincluding a horizontal peripheral wall having an opening portion; a packreceptacle defined within the casing and communicating with the openingportion; a packaged first functional component stored in the packreceptacle such that the first functional component can be detachedthrough the opening portion; and a packaged second functional componentstored in the pack receptacle, covering the first functional componentin a direction from the opening portion, such that the second functionalcomponent can be detached through the opening portion, said first andsecond functional components are layered on each other in the thicknessdirection of the casing in the pack receptacle.

In this structure, since the first and second functional components areinserted and detached through one single opening portion, it is notnecessary to form a plurality of opening portions which are respectivelyused for inserting and detaching a plurality of functional components.Therefore, the structure of the casing can be simplified.

In addition, the flat area occupied by two functional components isreduced to be smaller in comparison with a case where the first andsecond functional components are disposed in the width direction or thedepth direction of the casing. Therefore, it is possible to save a spacefor storing other components, without enlarging the shape of the flatarea of the casing.

Also in order to achieve the second object, the portable electronicapparatus according to the present invention comprises: a box-likecasing including a horizontal peripheral wall having an opening portion;a pack receptacle defined within the casing and communicating with theopening portion; a packaged first functional component stored in thepack receptacle such that the first functional component can be detachedthrough the opening portion; and a packaged second functional componentstored in the pack receptacle and layered on the first functionalcomponent so as to cover the first functional component in a directionfrom the opening portion, such that the second functional component canbe detached through the opening portion, said second functionalcomponent having a cover portion integrally formed, for covering theopening portion when the second functional component is stored in thepack receptacle, said cover portion continued to the peripheral wall ofthe casing.

In this structure, since the first and second functional components areinserted and detached through one single opening portion, it is notnecessary to form a plurality of opening portions which are respectivelyused for inserting and detaching a plurality of functional components.Therefore, the structure of the casing can be simplified. Further, atthe same time when the second functional component is stored in the packreceptacle, the opening portion is closed by the cover portion.Therefore, the opening portion cannot be left opened, and it is possibleto prevent dust or the like from entering into the pack receptacle.

In addition, the flat area occupied by two functional components isreduced to be smaller in comparison with a case where the first andsecond functional components are disposed in the width direction or thedepth direction of the casing. Therefore, it is possible to save a spacefor storing other components, without enlarging the shape of the flatarea of the casing.

Additional objects and advantages of the invention will be set forth inthe description which follows, and in part will be obvious from thedescription, or may be learned by practice of the invention. The objectsand advantages of the invention may be realized and obtained by means ofthe instrumentalities and combinations particularly pointed out in theappended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are incorporated in and constitute apart of the specification, illustrate presently preferred embodiments ofthe invention and, together with the general description given above andthe detailed description of the preferred embodiments given below, serveto explain the principles of the invention.

FIGS. 1 to 29 explain the first embodiment of the present invention.

FIG. 1 is a perspective view showing a portable computer.

FIG. 2 is a perspective view showing the portable computer placed withits bottom wall of a casing oriented upwardly.

FIG. 3 is a cross-section of the portable computer.

FIG. 4 is a perspective view showing the portable computer where akeyboard is detached from a keyboard mount portion.

FIG. 5 is a perspective view showing a position relationship between aheat sink and a heat-radiation plate.

FIG. 6 is a cross-section of the portable computer, showing thestructure of a mount portion of the heat sink for cooling a TCP.

FIG. 7 is a perspective view of a card receptacle.

FIG. 8 is a perspective view where a first circuit board having the cardreceptacle and a card cover are detached from a lower housing.

FIG. 9 is a perspective view where the card cover is detached from thelower housing.

FIG. 10 is a cross-section of the portable computer where a battery packand a hard-disc drive device are attached to a first pack receptacle ofthe casing.

FIG. 11 is a perspective view of the portable computer where thehard-disc drive device and the battery pack are detached from the firstpack receptacle.

FIG. 12 is a perspective view of the portable computer where the batterypack is detached from the first pack receptacle of the casing, and thehard-disc drive device is exposed.

FIG. 13 is a perspective view of the portable computer where a cover isdetached from the casing and the battery pack of the first packreceptacle is exposed.

FIG. 14 is a perspective view of the portable computer where the batterypack has jumped out of the first pack receptacle of the casing.

FIG. 15 is a perspective view of the portable computer, showing the partof a portion where a locking member and a pressure plate are installed.

FIG. 16 is a perspective view showing a relationship between the lockingmember, an engagement member, and a spring member pressing them,disassembled from each other.

FIG. 17 is a bottom view of the casing where the hard-disc drive deviceis contained in the first pack receptacle.

FIG. 18A is a cross-section of the portable computer where the batterypack is contained in the first pack receptacle of the casing.

FIG. 18B is a cross-section of the portable computer where the batterypack has jumped out from the first pack receptacle of the casing.

FIG. 19A is a cross-section of the portable computer where the batterycover is locked on the casing.

FIG. 19B is a cross-section of the portable computer where the lockingof the battery pack is released.

FIG. 20 is a cross-section of the portable computer where the batterycover is hooked on the casing.

FIG. 21 is a perspective view showing a second pack receptacle of thecasing as well as a CD-ROM drive device and a floppy disc drive devicewhich can be selectively detached to the second pack receptacle.

FIG. 22 is a perspective view of the CD-ROM drive device.

FIG. 23 is a perspective view of the floppy disc drive device.

FIG. 24 is a plan view showing the second pack receptacle where anoperation lever of an ejector is locked.

FIG. 25 is a plan view showing the second pack receptacle where thelocking of the operation lever of the ejector is released.

FIG. 26A is a plan view where the CD-ROM drive device or the floppy discdrive device is locked on the second pack receptacle.

FIG. 26B is a plan view where the locking of the CD-ROM drive device orthe floppy disc drive device is released.

FIG. 27A is a cross-section of the portable computer where the operationlever of the ejector is rotated to a first position.

FIG. 27B is a cross-section enlarging and showing a portion R of FIG.27A.

FIG. 28A is a cross-section of the portable computer where the operationlever of the ejector is rotated to a second position.

FIG. 28B is a perspective view where the operation lever of the ejectoris rotated to the second position.

FIG. 29A is a cross-section where the operation lever of the ejector islocked.

FIG. 29B is a cross-section where the locking of the operation lever ofthe ejector is released.

FIG. 30 is a perspective view of a portable computer where a batterypack is detached from the first pack receptacle of the casing, therebyexposing the hard-disc drive device, in the second embodiment.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

In the following, the first embodiment of the present invention will beexplained with reference to FIGS. 1 to 29.

FIGS. 1 and 2 show a book type portable computer 1 of A4 size. Thiscomputer 1 comprises a flat box-like casing 2 and a display unit 3supported on the casing 2. The casing 2 has a lower housing 5 and anupper housing 6 connected with the lower housing 5. These housings 5 and6 are made of synthetic resin material such as ABS resin.

As shown in FIGS. 2 and 3, the lower housing 5 includes a flat bottomwall 5 a, a pair of side walls 5 b and 5 c continuing to the bottom wall5 a, as well as a front wall 5 d and a rear wall 5 e. The side walls 5 band 5 c as well as the front wall 5 d and rear wall 5 e extend upwardlyfrom the peripheral portions of the bottom wall 5 a.

The upper housing 6 has a substantially flat plate-like shape includingan upper wall 6 a. The peripheral portions of the upper wall 6 a areconnected to the side walls 5 b and 5 c and the front and rear walls 5 dand 5 e. The upper wall 6 a of the upper housing 6 consists of front andrear halves. The front half of the upper wall 6 a forms an arm rest 8.The rear half of the upper wall 6 a is connected to the arm rest 8, anda keyboard mount portion 9 is formed on the rear half. The keyboardmount portion 9 is formed as a rectangular concave portion having sizesubstantially covering the entire of the rear half.

As shown in FIGS. 3 and 5, the keyboard mount portion 9 has a wall 10extending downwardly from the upper wall 6 a and a keyboard support wall11 connected to the lower end portion of the wall 10. The keyboardsupport wall 11 is arranged substantially in parallel with the bottomwall 5 a. A through-hole 11 a communicating to the inside of the lowerhousing 5 is formed in the left half of the keyboard support wall 11.

A keyboard 13 is detachably mounted on the keyboard mount portion 9. Thekeyboard 13 comprises a keyboard panel 14 made of synthetic resin, anumber of keys 15 disposed on the upper surface of the keyboard panel14, and a joy-stick 16 as a kind of pointing device provided on theupper surface of the keyboard panel 14. The keyboard panel 14 has arectangular plate-like shape of a size which can be engaged with thekeyboard mount portion 9. The lower surface of the keyboard panel 14 iscovered with a reinforcement plate 17 made of metal. The reinforcementplate 17 reinforces the keyboard panel 14, and prevents switching noisegenerated by operation of keys 15 from leaking into the inside of thecasing 2. This reinforcement plate 17 is made of aluminum alloy whichattains a high heat transmissions, and has a size large enough to coverthe entire lower surface of the keyboard panel 14. The keyboard panel 14has front and rear edge portions. These front and rear edge portions aredetachably engaged with the wall 10 of the keyboard mount portion 9. Inaddition, the reinforcement plate 17 is layered over the upper surfaceof the keyboard support wall 11.

A keyboard holding panel 19 is detachably engaged in the keyboard mountportion 9. The keyboard holding panel 19 in cooperation with the frontedge portion of the keyboard mount portion 9 presses the front edgeportion of the keyboard panel 14, and the keyboard 13 is thereby held atthe keyboard mount portion 9. The upper surface of the keyboard holdingpanel 19 is connected to the arm rest 8. A pair of click switch buttons20 a and 20 b are arranged in the substantial center portion of the armrest 8. The click switch buttons 20 a and 20 b are used for executingand canceling a command, and slightly project from the upper surface ofthe arm rest 8.

As shown in FIGS. 1 and 3, the upper wall 6 a of the upper housing 6 hasa hollow convex portion 22. The convex portion 22 extends in the widthdirection of the upper housing 6 immediately behind the keyboard mountportion 9. This convex portion 22 includes a pair of display supportportions 23 a and 23 b. Each of the display support portions 23 a and 23b is a concave portion continuously opened in the front, upper, and rearsides of the convex portion 22, and the display unit 3 is supported bythe display support portions 23 a and 23 b.

The display unit 3 comprises a housing 25 and a color liquid crystaldisplay 26 contained inside the housing 25. The housing 25 has a pair ofleg portions 28 a and 28 b. These leg portions 28 a and 28 b arerespectively inserted into the display support portions 23 a and 23 b,and are rotatably connected with the casing 2 through the hinge devices29. FIG. 3 shows a connecting portion where a leg portion 28 b isconnected with the display support portion 23 b. As is apparent fromFIG. 3, the above hinge device 29 comprises a hinge shaft 30 extendinghorizontally, a first bracket 31 fixed at a first end of the hinge shaft30, and a second bracket 32 rotatably connected with a second end of thehinge shaft 30.

The hinge shaft 30 penetrates between the display support portion 23 band the leg portion 28 b. The first end of the hinge shaft 30 isinserted into the leg portion 28 b, and the first bracket 31 of thefirst end is secured to the inner surface of the leg portion 28 b byscrews. The second end of the hinge shaft 30 is introduced into theconvex portion 22, and the second bracket 32 of the second end issecured to the upper housing 6 and the lower housing 5 by screws. Asshown in FIGS. 3 to 5, the second bracket 32 of the hinge device 29 hasa support stay 32 a extending in the depth direction of the upperhousing 6. The support stay 32 a is exposed toward the bottom of thekeyboard mount portion 9, and the reinforcement plate 17 of the keyboard13 is in contact with the upper surface of the support stay 32 a.

As shown in FIG. 3, the support stay 32 a of the right-hand side hingedevice 29 has an elongated portion 32 b extending to the right endportion of the arm rest 8. The elongated portion 32 b faces the lowersurface of the right end portion of the arm rest 8. A plurality of bossportions 33 for receiving the elongated portion 32 b are provided on thelower surface of the arm rest 8.

As shown in FIGS. 6 and 10, first to third circuit boards 34 to 36 arecontained in the casing 2. The first circuit board 34 is a system boardpositioned in the left half of the lower housing 5. The first circuitboard 34 is secured to the bottom wall 5 a of the lower housing 5 byscrews, in substantial parallel with the bottom wall 5 a. As shown inFIG. 24, the first circuit board 34 has a connector support portion 34a. The connector support portion 34 a extends along the rear wall 5 e ofthe lower housing 5, in the rear end portion of the first circuit board34. The connector support portion 34 a is equipped with a plurality ofconnectors 38 for connection to a printer, an external floppy disc drivedevice, a CRT display, and the likes.

The second circuit board 35 is a sound board, and is arranged insubstantial parallel with the first circuit board 34 above the front endportion of the first circuit board 34. The second circuit board 35 ispositioned below the arm rest 8. A pair of click switches 37 (one ofwhich is shown) which are operated by the click switch buttons 20 a and20 b are provided on the upper surface of the circuit board 35. Thesecond circuit board 35 is electrically connected to the first circuitboard 34 through a stacking connector.

The third circuit board 36 is a relay board, and is arranged below thekeyboard mount portion 9, as shown in FIG. 5. A part of the thirdcircuit board 36 faces the through-hole 11 a of the keyboard mountportion 9. A cable 39 communicating with the liquid crystal display 26described above is connected to the third circuit board 36. In addition,the third circuit board 36 is electrically connected to the firstcircuit board 34 through a stacking connector.

As shown in FIG. 6, a TCP (tape carrier package) 43 is installed on thelower surface of the first circuit board 34. The TCP 43 exhibits a veryhigh calorific value during operation, due to its high speed processingand large capacity achieved in response to demands for variations offunctions. The first circuit board 34 has a hole 44 of a square shapefacing the IC chip (not shown) of the TCP 43.

The first circuit board 34 is equipped with a heat radiation unit 45which receives heats from the TCP 43. The heat radiation unit 45 has aheat conductive member 46 and a cover 47. The heat conductive member 46is made of metal material which has an excellent heat conductivity suchas brass or aluminum alloy, for example. The heat conductive member 46is secured to the upper surface of the first circuit board 34 by screws.The heat conductive member 46 has a heat receiving portion 50 which isengaged in the hole 44. The lower surface of the heat receiving portion50 is stuck on the TCP 43. The cover 47 is arranged on the lower surfaceof the first circuit board 34. This cover 47 covers the TCP 43 in thelower side of the first circuit board 34. The cover 47 has a cover panel51 made of metal. This cover panel 51 is in contact with the TCP 43through an elastic sheet 52 having a heat conductivity. Therefore, whenthe TCP 43 generates a heat, the heat is transferred so as to escapethrough the heat conductive member 46 and the cover 47.

A heat sink 55 is provided on the upper surface of the heat conductivemember 46. The heat sink 55 comprises a heat radiation panel 56. Theheat radiation panel 56 is made of metal material having an excellentheat conductivity, such as aluminum alloy or magnesium alloy, forexample, and is secured to the heat conductive member 46 by screws. Asshown in FIGS. 5 and 6, a plurality of baffle plates 58 extending in thedepth direction of the casing 2 and a number of heat radiationprojections 59 are provided on the upper surface of the heat radiationpanel 56.

An electric fan 60 is equipped at the rear end of the heat radiationpanel 56. The electric fan 60 serves to forcibly cooling the heatradiation panel 56, and is driven when the temperature of the TCP 43reaches a predetermined value. This electric fan 60 is provided adjacentto the rear wall 5 e of the lower housing 5. An exhaust port 61 facingthe electric fan 60 is provided in the rear wall 5 e. Therefore, whenthe electric fan 60 is driven, air inside the casing 2 flows around theheat radiation projections 59 in the direction toward the electric fan60. This air flow forcibly cools, as cooling air, the heat conductivemember 46 and the heat radiation panel 56, and is exhausted out of thecasing 2 through the exhaust port 61. As a result of this, the heatconductive member 46 and the heat radiation panel 56 are efficientlycooled, so that the heat radiation ability of the TCP 43 is thus raised.

As shown in FIG. 5, the heat sink 55 is positioned below the left endportion of the keyboard mount portion 9. The heat sink 55 faces thethrough-hole 11 aof the keyboard support wall 11. This heat sink 55 isequipped with a heat radiation plate 64. The heat radiation plate 64 ismade of metal material which has an excellent heat conductivity, such asaluminum alloy, for example. This heat radiation plate 64 includes aplate body 65 of a flat shape and a connecting part 66 which iscontinuously connected to the plate body 65. The plate body 65 has asize substantially large enough to cover the right half of the keyboardsupport wall 11, and is layered on the upper surface of the keyboardsupport wall 11. Therefore, the plate body 65 is in contact with thelower surface of the reinforcement plate 17 of the keyboard 13.

The connecting part 66 faces the heat sink 55 through the through hole11 a of the keyboard support wall 11. This connecting part 66 is securedto upper end portions of the baffle walls 58 by screws 67. Therefore, apart of a heat transferred to the heat sink 55 from the TCP 43 escapesto the plate body 65, through the connecting part 66, and furtherescapes from the plate body 65 to the reinforcement plate 17.

As shown in FIGS. 7 and 8, a card receptacle 71 is provided in thecasing 2. The card receptacle 71 is used for detachably containing anexpansion card 72 such as a PCMCIA (personal computer memory cardinternational association) card or an interface card. This cardreceptacle 71 is positioned below the left end portion of the arm rest8. The card receptacle 71 comprises a card connector 73 to be connectedwith the expansion card 72, and a case 74 made of metal material,continued to the card connector 73. The card connector 73 and case 74are supported on the upper surface of the first circuit board 34. Thecase 74 has a hollow box-like shape. This case 74 comprises a pair ofguide walls 75 a and 75 b for guiding the expansion card 72 to the cardconnector 73, and an ejector 76 for ejecting the expansion card 72. Theejector 76 has a pair of operation levers 77 a and 77 b which areoperated by an operator. The operation levers 77 a and 77 b are slidablysupported on one of the guide wall 75 a, and are layered thereon in theheight direction of the guide wall 75 a.

As shown in FIG. 8, the case 74 has a card inlet port 78 facing the cardconnector 73. The card inlet port 78 is provided adjacent to the sidewall 5 b in the left side of the lower housing 5. A card insertion port79 is open in the side wall 5 b. The card insertion port 79 faces thecard inlet port 78, and operation levers 77 a and 77 b of the ejector 76are positioned at an end portion of the card insertion port 79.

The card receptacle 71 comprises a card cover 81 for opening and closingthe card insertion port 79. The card cover 81 comprises first and secondcover parts 82 a and 82 b both made of synthetic resin, as well as abracket 83 for supporting the cover parts 82 a and 82 b made of metal.Each of the first and second cover parts 82 a and 82 b has an elongatedrectangular shapes extending the depth direction of the lower housing 5.The bracket 83 has lower and upper walls 84 a and 84 b facing eachother, as well as a pair of side walls 84 c and 84 d for connecting thelower and upper walls 84 a and 84 b. These walls 84 a to 84 d surroundthe card inlet port 78 of the card cover 81.

The lower and upper walls 84 a and 84 b respectively have a pair ofsupport parts 85 a and 85 b and a pair of support parts 86 a and 86 b.The support parts 85 a and 85 b rotatably support the first cover part82 a. The support part 86 a and 86 b rotatably support the second coverpart 82 b. The first and second cover parts 82 a and 82 b are alwaysrespectively rotated in the direction in which the card insertion port79 is closed, by coil springs 87. Therefore, the first and second coverparts 82 a and 82 b are held by the bracket 83 such that the cover parts82 a and 82 b are continuously extending on one single plane.

As shown in FIG. 9, the lower wall 84 a of the bracket 83 is layered onthe bottom wall 5 a of the lower housing 5. The lower wall 84 a has apair of fixing parts 88 a and 88 b. In addition, the bottom wall 5 a ofthe lower housing 5 has a pair of boss portions 89 a and 89 b. The bossportions 89 a and 89 b are positioned at end portions continued to thecard insertion port 79, and the fixing parts 88 a and 88 b are fixed tothe upper surfaces of the boss portions 89 a and 89 b, by screws 90.Therefore, the card cover 81 is supported on the lower housing 5 throughthe bracket 83, and the first and second cover parts 82 a and 82 b whichcan be opened and closed cover the card insertion port 79.

As shown in FIGS. 3 and 10, the casing 2 has a first pack receptacle100. This first pack receptacle 100 is positioned below the arm rest 8.The first pack receptacle 100 has an opening portion 100 a open in thebottom wall 5 a of the lower housing 5, as shown in FIG. 11. The openingportion 100 a faces the arm rest 8, and the inner surface of the armrest 8 also serves as a ceiling of the first pack receptacle 100. Theopening portion 100 a of the first pack receptacle 100 has a rectangularshape including a long axis X1 extending in the width direction of thecasing 2 and a short axis X2 extending in the depth direction of thecasing 2.

The first pack receptacle 100 has a stand wall 101 extending upwardlyfrom the bottom wall 5 a of the lower housing 5, and a board supportwall 102 communicating with the upper end of the stand wall 101. Thestand wall 101 extends along the width direction of the lower hosing 5,and serves as a partition between the first pack receptacle 100 and theinside of the casing 2. The board support wall 102 is positioned belowthe arm rest 8 in the left end portion of the first pack receptacle 100.This board support wall 102 is provided in substantial parallel with thearm rest 8.

As shown in FIG. 10, the first pack receptacle 100 has a hard-disccontainer room 103 as a first section and a battery container room 104as a second section. The hard-disc container room 103 and the batterycontainer room 104 are disposed to be adjacent to each other in theheight direction of the casing 2. The hard-disc container room 103 ispositioned above the board support wall 102. The battery container room104 is positioned below the board support wall 102. The hard-disccontainer room 103 is shorter in the width direction of the casing 2, bythe size of the board support wall 102, than the battery container room104. Therefore, the hard-disc container room 103 has an area smallerthan the battery container room 104. This hard-disc container room 103communicates with the opening portion 100 a of the bottom wall 5 athrough the battery container room 104.

As shown in FIG. 10, the right end portion of the second circuit board35 is secured to the upper surface of the board support wall 102 byscrews. The right end portion of the second circuit board 35 faces thehard-disc container room 103. A hard-disc connector 105 is provided onthe lower surface of the right end portion of the circuit board 35. Thishard-disc connector 105 is exposed to the hard-disc container room 103.

As shown in FIGS. 10 and 11, a battery connector 108 is provided at theleft end portion of the battery container room 104. The batteryconnector 108 is supported on the upper surface of the first circuitboard 34. The battery connector 108 has a plurality of connectionterminals 109. These connection terminals 109 are exposed to the batterycontainer room 104, and are elastically energized in the directionextending toward the battery container room 104.

As shown in FIGS. 10 and 15, the battery container room 104 has an innerwall 110 facing the battery connector 108 and an upper wall 111connected to the inner wall 110. The inner wall 110 is provided alongthe side wall 5 c, inside the right side wall 5 c of the lower housing5, as shown in FIG. 16. Between the inner wall 110 and the side wall 5c, a clearance 112 is formed. The lower end portion of the inner wall110 and the lower end portion of the side wall 5 c are connected witheach other through a connection wall 113. This connection wall 113covers the lower end portion of the clearance 112, and faces the openingportion 100 a. As shown in FIGS. 3, 10, and 15, the upper wall 111extends horizontally between the front wall 5 d of the lower housing 5and the stand wall 101. The upper wall 111 faces the boss portions 33 ofthe arm rest 8, and the elongated portion 32 b of the hinge device 29 isinserted between the upper wall 111 and the boss portions 33. The upperwall 111 and the elongated portion 32 b are fixed to the boss portions33 by screws 114.

The first pack receptacle 100 has a guide wall 115 connected to theupper wall 111. The guide wall 115 extends horizontally between thefront wall 5 d of the lower housing 5 and the stand wall 101. This guidewall 115 enters into the hard-disc container room 103, and is providedat a position closer to the arm rest 8 than the upper wall 111.

As shown in FIGS. 10 and 19A, the elongated portion 32 b of the hingedevice 29 has a pair of screw receiving portions 116 (one of which isshown). The screw receiving portions 116 are layered on the uppersurface of the guide wall 115. A pair of through-holes 117 a and 117 bcommunicating with the screw receiving portion 116 are open in thisguide wall 115.

As shown in FIGS. 10 and 11, a hard-disc drive device 118 as a firstfunctional component is detachably contained in the hard disc containerroom 103 of the first pack receptacle 100. The hard-disc drive device118 comprises a box-like housing 119. A magnetic head and a disc-likemagnetic recording medium (not shown) are contained in the housing 119.The housing 119 has a size which allows the housing 119 to be engaged inthe hard-disc container room 103. The housing 119 can be set in andremoved out of the hard-disc container room 103 through the openingportion 100 a of the bottom wall 5 a and the battery container room 104.The hard-disc drive device 118 has a relay connector 120. The relayconnector 120 is provided at an end portion of the housing 119. Thisrelay connector 120 is arranged such that it is detachably connectedwith the hard-disc connector 105 when the hard-disc drive device 118 iscontained in the hard-disc container room 103.

The housing 119 is provided with a bracket 121 made of sheet metal. Thebracket 121 has a first cover portion 122 for covering the bottomsurface of the housing 119 and a second cover portion 123 for coveringthe end surface of the housing 119. The first cover portion 122 has aflat plate-like shape. A pair of projections 130 serves asidentification marks are formed on this first cover portion 122. Theseprojections 130 project toward the battery container room 104 describedabove. The second cover portion 123 integrally comprises a stopperportion 125 to be hooked by a finger, and a pair of tongue parts 126 aand 126 b. The stopper portion 125 and the tongue parts 126 a and 126 bare positioned in the side opposite to the relay connector 120. Thetongue parts 126 a and 126 b are arranged such that these parts arelayered on the lower surface of the guide wall 115 when the hard-discdrive device 118 is contained in the hard-disc container room 103.Screws 127 penetrate through the tongue parts 126 a and 126 b. Thescrews 127 penetrate through through-holes 117 a and 117 b of the guidewall 114 and are screwed into the screw receive portion 116 describedabove. By thus screwing the screws 127, the hard-disc drive device 118is fixed to the hard-disc container room 103.

The hard-disc drive device 118 as described above is attached to thehard-disc container room 103 in the following procedures. At first, thecomputer 1 is placed up side down, so that the bottom wall 5 a of thecasing 2 and the opening portion 100 a of the first pack receptacle 100are oriented upwardly, as shown in FIG. 11. In this condition, thehard-disc drive device 118 is inserted into the hard-disc container room103 through the opening portion 100 a of the bottom wall 5 a and throughthe battery container room 104. In this manner, the relay connector 120in the hard-disc drive device 118 faces the hard-disc connector 105, andsimultaneously, the tongue parts 126 a and 126 b of the bracket 121 arelayered on the guide wall 115.

In the next, a user hooks his or her finger on the stopper portion 125and slides the hard-disc drive device 118 in the direction toward thehard-disc connector 105. By thus sliding the device 118, the relayconnector 120 is engaged with the hard-disc connector 105, so that thehard-disc drive device 118 is electrically connected with the computer1.

Further, screws 127 are inserted into the tongue parts 126 a and 126 bof the bracket 121 until these screws 127 are screwed into the screwreceiving portion 116. As a result, the hard-disc drive device 118 isfixed to the hard-disc container room 103, maintaining the engagementbetween the relay connector 120 and the hard-disc connector 105. Whenthe hard-disc drive device 118 is kept fixed to the hard-disc containerroom 103, as shown in FIGS. 10 and 12, the first cover portion 122 ofthe bracket 121 continues to the board support wall 102, and these firstcover portion 122 and the board support wall 102 are positioned on onesubstantial same plane. Therefore, the first cover portion 122constitutes the ceiling wall of the battery container room 104, incooperation with the board support wall 102.

As shown in FIG. 11, a battery pack 135 as a second functional componentis detachably contained in the battery container room 104. The batterypack 135 functions as a drive power source for the computer 1 when thecomputer 1 is used at a spot where commercial alternating current powersource is not available. This battery pack 135 can be set in and removedout of the battery container room 104, through the opening portion 100 aof the lower housing 5, like the hard-disc drive device 118.

As shown in FIG. 10, the battery pack 135 comprises a battery case 136made of synthetic resin and a plurality of nickel hydrogen secondarybatteries 137 contained in the battery case 136. The battery case 136has a rectangular box-like shape in compliance with the shape of theopening of the opening portion 100 a, and has a flat area larger thanthe hard-disc drive device 118. The batter pack 135 has a weight ofabout 300 to 600 g.

The battery case 136 has a first end provided with a plurality ofterminal plates 138 and a second end positioned opposite to the firstend. The terminal plates 138 are connected to the nickel hydrogensecondary battery 137, and serve as positive and negative terminals ofthe battery pack 135. The upper surface of the battery case 136 isarranged so as to face the board support wall 102 described above andthe first cover portion 122 of the hard-disc drive device 118, when thebattery pack 135 is contained in the battery container room 104. A pairof first concave portions 140 are provided in the upper surface of thebattery case 136. In addition, a pair of second concave portions 141 areprovided in the bottom surface of the battery case 136. The positions ofthe concave portions 140 and 141 are determined in accordance with thetype and the performance of the battery pack 135. Therefore, if theposition of the first and second concave portions 140 and 141 areobserved, whether or not a battery pack 135 is applicable to thecomputer 1 can be identified. The second end of the battery case 136 hasa bending portion 142 bent like an arc. The bending portion 142 ispositioned at a corner portion defined by the end surface and the uppersurface which are positioned opposite to the terminal plates 138 of thebatter case 136.

This battery pack 135 is attached to the battery container room 104 inthe following procedures. At first, as shown in FIG. 11, the computer 1is placed up side down, so that the bottom wall 5 a and the openingportion 100 a of the first pack receptacle 100 face upwardly. In thisstate, the first end of the battery pack 135 is inserted into thebattery container room 104 through the opening portion 100 a, therebymaking terminal plates 138 in contact with the connection terminals 109of the battery connector 108. In the next, the battery pack 135 isrotated downwardly around a fulcrum of a connecting portion between theterminal plates 138 and the connection terminals 109, so that thebattery pack 135 falls into the battery container room 104. As a resultof this, the first concave portion 140 of the upper surface of thebattery case 136 faces the projection 130 of the hard-disc drive device118, and the project 130 enters into the first concave portion 140.Therefore, the battery pack 135 is contained in the battery containerroom 104, with the upper surface of the battery case 136 kepthorizontally in contact with the board support wall 102 and the firstcover portion 122 of the hard-disc drive device 118. Whether or not thebattery pack 135 is applicable to the computer 1 is thereby determined.

Specifically, if an unallowable battery pack which has a first concaveportion 140 formed at a different position is inserted into the batterycontainer room 104, or if a battery pack is inserted up side down intothe battery container room 104, the projection 130 of the hard-discdrive device 118 collides into the upper surface or bottom surface ofthe battery case 136. Then, the battery pack 135 leans in the batterycontainer room 104, and therefore, cannot be properly contained in thebattery container room 104. Therefore, an operator can thus confirm anwrong selection of a battery pack 135, or a reversed orientation of thebattery pack 135, so that wrong attachment of the battery pack 135 canbe prevented.

If a battery pack 135 is attached to the battery container room 104 in acorrect manner, the battery pack 135 is pressed in the direction towardthe inner wall 110, by the connection terminals 109 of the batteryconnector 108. As a result, the battery pack 135 is kept in the batterycontainer room 104, covering the hard-disc drive device 118 from underside of this device 118.

As shown in FIGS. 12 and 13, the battery container room 104 is providedwith a locking member 150 for locking the battery pack 135. The lockingmember 150 is made of synthetic resin material, and is positioned in theside opposite to the battery connector 108. As shown in FIG. 16, thelocking member 150 has a substantially flat plate-like shape. Thislocking member 150 comprises an end portion having a pair of shaftportions 151 a and 151 b as well as a pair of spring receiving portions152, and another end having a stopper claw 155. The locking member 150is inserted in the clearance 112 between the side wall 5 c of the lowerhousing 5 and the inner wall 110. The connection wall 113 which closesthe lower end of the clearance 112 has a first through-hole 154 a. Theinner wall 110 connected to the connection wall 113 has a secondthrough-hole 154 b. These first and second through-holes 154 a and 154 bcommunicate with each other at the right end portion of the batterycontainer room 104. The locking member 150 is inserted in the firstthrough-hole 154 a, and the shaft portions 151 a and 151 b of thelocking member 150 are rotatably hooked on an open edge portion of thefirst through-hole 154 a. Therefore, an end portion of the lockingmember 150 is exposed to the battery container room 104 through thesecond through-hole 154 b, and the spring receiving portions 152 thereoffaces the side wall 5 c. In addition, the other end portion of thelocking member 150 projects downwardly through the first through-hole154, and the stopper claw 155 thereof is positioned below the connectionwall 113.

As shown in FIG. 18A, where the battery pack 135 is correctly attachedto the battery container room 104, an end surface continued to thebending portion 142 of the battery case 136 faces the inner wall 110.The end surface of the battery case 136 is in contact with the lockingmember 150, and the stopper claw 155 of this locking member 150 ishooked on a corner portion 136 a defined by the bottom surface and theend surface of the battery case 136. Therefore, the locking member 150is supported on the battery container room 104, such that the lockingmember 150 is rotatable between a locked position as shown in FIG. 18Ain which the stopper claw 155 is hooked on the corner portion 136 a anda lock-released position as shown in FIG. 18B in which the stopper claw155 gets off from the corner portion 136 a of the battery case 136.

As shown in FIGS. 18A and 18B, a spring member 157 made of sheet metalis provided on the upper surface of the upper wall 111. The springmember 157 has a pair of first press parts 159 which can be elasticallydeformed. The first press parts 159 enter into the clearance 112, andthe top end of the first press parts 15 are in contact with the springreceiving portion 152 of the locking member 150. The first press parts159 press the spring receiving portion 152 against the side wall 5 c. Bythus pressing the spring receiving portion 152, the locking member 150is always kept in a locked position, and the stopper claw 155 of thelocking member 150 is kept engaged with the battery case 136.

As shown in FIG. 14, if the battery pack 135 is inserted into thebattery container room 104, oriented in a correct direction, the bendingportion 142 of the battery case 136 is brought into contact with thestopper claw 155. In this state, the battery pack 135 is pressed in thedirection toward the inner wall 110 by the connection terminals 109 ofthe battery connector 108, so that the stopper claw 155 is slidablypressed against the bending portion 142 in accordance with an operationof inserting the battery pack 135. In this manner, the locking member150 is gradually pushed back from the locked position to thelock-released position in accordance with the shape of the bendingportion 142. As a result of this, the bending portion 142 of the batterypack 135 functions as a kind of cam surface which rotates the lockingmember 150 to the lock-released position, so that the operation ofinserting the battery pack 135 is not disturbed.

As shown in FIGS. 10 and 18A, when the battery pack 135 is correctlyattached to the battery container room 104, the corner portion 136 a ofthe battery case 136 faces the stopper claw 155, thereby releasing thepressure from the battery case 136 against the stopper claw 155.Therefore, the locking member 150 is forcibly rotated to the lockedposition by the spring member 157, and the stopper claw 155 is hooked onthe corner portion 136 a of the battery case 136. As a result of this,the battery pack 135 is maintained in the battery container room 104.

When the battery pack 135 is inserted up side down in the batterycontainer room 104, the corner portion 136 a positioned in the sideopposite to the bending portion 142 of the battery case 136 is broughtinto contact with the stopper claw 155. This corner portion 136 a issharp at right angles. Therefore the corner portion 136 a is caught bythe stopper claw 155, so that the battery pack 135 cannot be insertedany more into the battery container room 104. Due to this, an operatorcan find that the battery pack 135 is inserted up side down. Thus, wronginsertion of the battery pack 135 is thus prevented previously.

As shown in FIG. 15, a pair of spring mount portions 163 a and 163 b areformed on the lower surface of the guide wall 115 facing the batterycontainer room 104. The spring mount portions 163 a and 163 b havehollow cylindrical shapes. These spring mount portions 163 a and 163 bare placed apart from each other in the direction of the short axis X2,in the vicinity of the locking member 150. A pressure means is supportedby the spring mount portions 163 a and 163 b. The pressure meanscomprises a pair of compression coil springs 164 a and 164 b mounted onthe spring mount portions 163 a and 163 b, and a pressure plate 165 heldbetween top end portions of the compression coil springs 164 a and 164b. The pressure plate 165 is in contact with the upper surface of thebattery case 136, with the battery pack 135 attached to the batterycontainer room 104. Therefore, the compression coil springs 164 a and164 b are compressed between the spring mount portions 163 a and 163 band the battery pack 135, and the second end of the battery pack 135 iscontinuously applied with a force acting so as to push out the batterypack 135 toward the opening portion 100 a.

Consequently, when the locking member 150 is rotated from the lockedposition to the lock-released position to detach the battery pack 135from the battery container room 104, the second end of the battery pack135 is forcibly pushed out from the battery container room 104. By thuspushing out the battery pack 135, the battery pack 135 is rotated arounda fulcrum of a connecting portion between the battery connector 108 andthe terminal plates 138, and the second end thereby jumps up from theopening portion 100 a of the casing 2.

As shown in FIG. 13, the bottom wall 5 a of the lower housing 5 isequipped with a battery cover 170 made of synthetic resin. The batterycover 170 serves to detachably cover the opening portion 100 a of thefirst pack receptacle 100 and the locking member 150. The battery cover170 has a cover body 171. The cover body 171 has a size equal to theshape of the opening of the opening portion 100 a, and is positioned inthe same plane as the bottom wall 5 a of the lower housing 5. The coverbody 171 has a first side wall 172 continued to the front wall 5 d ofthe lower housing 5, a second side wall 173 continued to the side wall 5c in the right side of the lower housing 5, and a third side wall 174 incontact with the stand wall 101 of the first pack receptacle 100. A pairof first engaging parts 171 a and 171 b are formed on the cover body171. The first engaging parts 171 a and 171 b are provided apart fromeach other, in the direction of the short axis X2 of the opening portion100 a, and is detachably hooked on the opening edge portion of theopening portion 100 a. The first side wall 172 has an edge portion wherea pair of second engaging parts 172 a and 172 b are formed. A pair ofthird engaging parts 174 a and 174 b are formed at the edge portion ofthe side wall 174. The second engaging parts 172 a and 172 b arearranged apart from each other in the direction of the long axis X1 ofthe opening portion 100 a. The third engaging parts 174 a and 174 b arearranged part from each other in the direction of long axis X1 of theopening portion 100 a. A pair of fourth engaging parts 173 a and 173 bare formed on the second side wall 173. These fourth engaging parts 173a and 173 b are arranged apart from each other in the direction of theshort axis X2 of the opening portion 100 a, and face the connection wall113 of the lower housing 5.

As shown in FIG. 12, a pair of engaging projections 176 a and 176 b aswell as a pair of engaging projections 177 a and 177 b are respectivelyformed on the stand wall 101 facing the battery container room 104 aswell as the front wall 5 d. The engaging projections 176 a and 176 b areprovided apart from each other in the direction of the long axis X1 ofthe opening portion 100 a. The engaging projections 177 a and 177 b areprovided apart from each other in the direction of the long axis X1 ofthe opening portion 100 a. In addition, a pair of stopper nails 178 aand 178 b are formed on the connecting wall 113. These stopper nails 178a and 178 b are provided apart from each other in the direction of theshort axis X2 of the opening portion 100 a.

The battery cover 170 is covered over the opening portion 100 a of thelower housing 5 and is then slided in the direction toward the batteryconnector 108. The battery cover 170 is thereby installed on the lowerhousing 5. Specifically, when the battery cover 170 is slided, the firstengaging parts 171 a and 171 b are caught by the opening edge portion ofthe opening portion 100 a, and simultaneously, the second engaging parts172 a and 172 b and the third engaging parts 174 a and 174 b are caughtby the engaging projections 176 a, 176 b, 177 a, and 177 b. The fourthengaging parts 173 a and 173 b are also caught by the stopper nails 178a and 178 b. As a result of this, the battery cover 170 is installed onthe lower housing 5, with the opening portion 100 a thereby covered, asshown in FIG. 10, and the inner surface of the cover body 171 is broughtinto contact with the bottom surface of the battery pack 135. A concaveportion 179 for avoiding interference with the stopper claw 155 of thelocking member 150 is formed on the inner surface of the cover body 171.

As shown in FIGS. 16 and 19A, the lower housing 5 comprises a holdingmember 185. The holding member 185 serves to keep the battery cover 170installed on the lower housing 5. The holding member 185 is provided inthe clearance 112 described above, and is arranged adjacent to thelocking member 150. The holding member 185 has a lock claw 186 extendingtoward the connecting wall 113. The top end of the locking claw 186faces a through-hole 187 opened in the connecting wall 113. The theholding member 185 is supported on the lower housing 5, such that theholding member 185 is movable between a first position as shown in FIG.19A where the locking claw 186 projects from the through-hole 187 and asecond position as shown in FIG. 19B where the locking claw 186 entersinto the through-hole 187. This holding member 185 comprises anoperation lever 188. The operation lever 188 is exposed to the rightside wall 5 c of the lower housing 5, and the holding member 185 ismoved between the first and second positions, by manually operating theoperation lever 188.

As shown in FIG. 16, the spring member 157 has an elongated portion 190extending upwardly over the holding member 185. A second pressure part191 which can be elastically deformed in the downward direction isintegrally formed on the top end of the elongated portion 190. The topend of the second pressure part 191 is brought into contact with theholding member 185, thereby pressing the holding member 185 in adownward direction. Therefore, the holding member 185 is continuouslyheld in the first position.

As shown in FIG. 19A, when the battery cover 170 is kept attached to thelower housing 5, the locking claw 186 is hooked on the second side wall173 of the battery cover 170. Hence, even when it is attempted to slidethe battery cover 170 away from the battery connector 108, the lockingclaw 186 prevents the battery cover 170 from being slided. As a resultof this, the battery cover 170 is kept on the lower housing 5, coveringthe opening portion 100 a and the locking member 150.

As shown in FIGS. 4 and 5, the keyboard support wall 11 of the upperhousing 6 described above comprises a sub-battery container portion 200.The sub-battery container portion 200 has a dish-like shape open in theupward direction, and is positioned inside the opening portion 11 a ofthe keyboard support wall 11. The sub-battery container 200 is providedbetween the heat sink 55 and the card receptacle 71. The sub-batterycontainer portion 200 has a side wall 201 connected to the opening edgeportion of the opening portion 11 a described above. The side wall 201is provided adjacent to the plate body 65 of the heat radiation plate64. The plate body 65 has a support part 202 for supporting the sidewall 201. Therefore, the sub-battery container portion 200 is supportedby the heat radiation plate 64, thereby preventing the sub-batterycontainer portion 200 from being deformed inside the opening portion 11a.

As shown in FIG. 4, a sub-battery 203 is contained in the sub-batterycontainer portion 200. The sub-battery 203 serves to set a resumefunction, and has a flat plate-like shape. The sub-battery 203 isconnected to the first circuit board 34 through a lead line 204 having aconnector 205.

As shown in FIGS. 3 and 21, the casing 2 comprises a second packreceptacle 210. The second pack receptacle 210 is positioned behind thefirst pack receptacle 100 and below the right half of the keyboard 13.The second pack receptacle 210 is defined by the bottom wall 5 a of thelower housing 5 and the stand wall 101. A guide wall 211 is formed onthe bottom wall 5 a. The guide wall 211 extends along the connectorsupport portion 34 a of the first circuit board 34, in parallel with thestand wall 101.

As shown in FIG. 27A, the second pack receptacle 210 comprises aninsertion port 212. The insertion port 212 is open in the right sidewall 5 c of the lower housing 5, and the support stay 32 a of the hingedevice 29 is provided along the upper edge opening portion of theinsertion port 212. Therefore, the support stay 32 a bridges over theinsertion port 212, and the support stay 32 a ensures the rigidity ofthe opening portion of the insertion port 212 in the casing 2.

As shown in FIGS. 21 and 27A, the second pack receptacle 210 comprises arelay connector 213. The relay connector 213 extends in the depthdirection of the casing 2, at the terminating end the second packreceptacle 210, and faces the insertion port 212. The relay connector213 is supported on the right end portion of the first circuit board 34,and is arranged adjacent to the bottom wall 5 a of the lower housing 5.The holder 215 made of sheet metal is secured on the upper surface ofthe first circuit board 34, by screws. The holder 215 covers the relayconnector 213, and the third circuit board 36 described above is securedon the holder 215, by screws.

As shown in FIGS. 21 and 27A, the second pack receptacle 210 comprisesan insertion guide 216. The insertion guide 216 is formed on the bottomwall 5 a of the lower housing 5. This insertion guide 216 has a flatguide surface 216 a slightly projecting from the upper surface of thebottom wall 5 a. The guide surface 216 a extends from immediately beforethe relay connector 213 toward the insertion port 212.

As shown in FIG. 21, a CD-ROM drive device 218 and a floppy disc drivedevice 219 are selectively and detachably attached to the second packreceptacle 210. Each of these CD-ROM drive device 218 and the floppydisc drive device 219 is packaged as a module having a specializedfunction.

As shown in FIG. 22, the CD-ROM drive device 218 comprises a casing 220having a flat box-like shape. The casing 220 has a guide frame 222 inwhich a disc insertion port 221 is opened. The guide frame 222 has asize which allows the guide frame 222 to be engaged in the insertionport 212. The casing 220 comprises a disc container portion 223 and adisc drive portion 224. The disc container portion 223 includes a tray225 which can be pulled out of the casing 220. The tray 225 serves tosupport an optical disc (not shown), and the size of this tray 225 isdefined in accordance with the diameter of an optical disc. An end plate225 a for opening and closing the disc insertion port 221 is provided atan end of the tray 225. The disc drive portion 224 has a motor forrotating an optical disc and a control unit for controlling the motor,and is positioned below the disc container portion 223.

As shown in FIGS. 3 and 22, the disc container portion 223 has anoverhang portion 223 a extending over the side of the disc drive portion224. The casing 220 has a concave portion 226 defined by the lowersurface of the overhang portion 223 a and the side surface of the discdrive portion 224. The concave portion 226 has a vertical side surface226 a and a horizontal lower surface 226 b connected to the upper end ofthe side surface 226 a, and is open toward the lateral side and thelower side of the casing 220. This concave portion 226 has a stopperwall 228 at an end portion adjacent to the guide frame 222. The stopperwall 228 laterally projects from the side surface 226 a of the concaveportion 226, and a locking groove 229 opened in the lateral direction isformed between the stopper wall 228 and the guide frame 222. The cornerportion opposite to the guide frame 222 of the stopper wall 228 forms aslanting surface 228 a obliquely cut.

As shown in FIG. 22, the casing 220 has a connector mount surface 220 a.The connector mount surface 220 a is positioned in the side opposite tothe guide frame 222. In the center portion of the connector mountsurface 220 a, a CD-ROM connector 231 is provided. The CD-ROM connector231 is detachably connected to the relay connector 213.

As the CD-ROM drive device 218 is inserted into the second packreceptacle 210 from the insertion port 212, the bottom surface of thecasing 220 is brought into contact with the guide surface 216 a of theinsertion guide 216 such that the bottom surface is slidable.Accordingly, the side surface 226 a of the concave portion 226 of thecasing 220 is brought into contact with the guide wall 211, and theposition of the CD-ROM connector 231 is aligned with the position of therelay connector 213. These connectors 213 and 231 are engaged with eachother when the CD-ROM drive device 218 is inserted to the terminatingend of the second pack receptacle 210. The CD-ROM drive device 218 isthereby electrically connected to the computer 1. When the CD-ROM drivedevice 218 is kept contained in the second pack receptacle 210, theconcave portion 226 of the casing 220 faces the connector supportportion 34 a of the first circuit board 34. Therefore, the connectorsupport portion 34 a enters in the concave portion 226 of the casing220.

As shown in FIG. 23, the floppy disc drive device 219 comprises a casing234 having a flat box-like shape, in which a disc insertion port 233 isopened. The casing 234 has a size substantially equal to the casing 220of the CD-ROM drive device 218 described above, and has an overhangportion 223 a, a concave portion 226, a stopper wall 228, and a lockinggroove 229, which are respectively similar to corresponding elements ofthe casing 220. The casing 234 has a connector mount surface 234 a. Theconnector mount surface 234 a is positioned in the side opposite to thedisc insertion port 233, and a FDD connector 235 is provided in thecenter portion of this connector mount surface 234 a. The FDD connector235 is detachably connected to the relay connector 213.

As the floppy disc drive device 219 is gradually inserted into thesecond pack receptacle 210 from the insertion port 212, the bottomsurface of the casing 234 is brought into contact with the guide surface216 a of the insertion guide 216 such that the bottom surface isslidable. Accordingly, the side surface 226 a of the concave portion 226of the casing 234 is brought into contact with the guide wall 211, andthe position of the FDD connector 235 is aligned with the position ofthe relay connector 213. These connectors 213 and 231 are engaged witheach other when the floppy disc drive device 219 is inserted to theterminating end of the second pack receptacle 210. The floppy disc drivedevice 219 is thereby electrically connected to the computer 1. When thefloppy disc drive device 219 is kept contained in the second packreceptacle 210, the concave portion 226 of the casing 234 faces theconnector support portion 34 a of the first circuit board 34. Therefore,the connector support portion 34 a enters in the concave portion 226 ofthe casing 234.

As shown in FIG. 21, a protect cover 240 made of metal is mounted on theconnector support potion 34 a. The protect cover 240 has a flat ceilingportion 241 facing the upper surface of the connector support portion 34a. The ceiling portion 241 covers and hide various circuit componentsand wirings installed on the upper surface of the connector supportportion 34 a. Therefore, when the CD-ROM drive device 218 or the floppydisc drive device 219 is detached from the second pack receptacle 210,the connector support portion 34 a is not observed through the insertionport 212, so that the commercial value of the computer 1 can thus beraised. In addition, due to the protect cover 240, foreign objects areadvantageously prevented from entering into the connector supportportion 34 a.

As shown in FIG. 3, the ceiling portion 241 of the protect cover 240faces the lower surface 226 b of the concave portion 226 of the casing220 or 234, when the CD-ROM drive device 218 or the floppy disc drivedevice 219 is contained in the second pack receptacle 210. Therefore,the ceiling portion 241 can be used as a guide for inserting the CD-ROMdrive device 218 or the floppy disc drive device 219 into the secondpack receptacle 210, if the ceiling portion 241 is arranged so as tohave a contact with the lower surface 226 b of the concave portion 226.

As shown in FIGS. 21, 24, and 26A, the second pack receptacle 210comprises a stopper 245 for locking the CD-ROM drive device 218 or thefloppy disc drive device 219 in the second pack receptacle 210. Thestopper 245 has a slider 246 having a flat plate-like shape. The slider246 is provided on the upper surface of the bottom wall 5 a of the lowerhousing 5, and is positioned between the insertion port 212 and theguide wall 211. This slider 246 is positioned between the casing 220 or234 and the bottom wall 5 a, while the CD-ROM drive device 218 or thefloppy disc drive device 219 is kept attached to the second packreceptacle 210.

The slider 246 has an end facing the concave portion 226 of the casing220 or 234. An engaging projection 247 projects from the end of theslider 246. The engaging projection 247 is detachably engaged with thelocking groove 229 of the casing 220 or 234, and is positioned in thevicinity of the insertion port 212. The engaging projection 247 has aslanting surface 247 a obliquely cut out at a corner portion facing theinsertion port 212. The slanting surface 247 a is arranged so as to bein contact with or to face the slanting surface 228 a of the stopperwall 228 when the CD-ROM drive device 218 or the floppy disc drivedevice 219 is inserted into the second pack receptacle 210. Theseslanting surfaces 247 a and 228 a are oblique in the same direction.

The slider 246 is supported on the bottom wall 5 a of the lower housing5, such that the slider 246 can be slided between a locked position asshown in FIG. 26A where the engaging projection 247 is engaged with thelocking groove 229 and a lock-released position as shown in FIG. 26Bwhere the engaging projection 247 is released off in the side of thelocking groove 229. This slider 246 comprises an operation lever 248.The operation lever 248 is exposed to the bottom wall 5 a of the lowerhousing 5 as shown in FIG. 2. By manually operating the operation lever248, the slider 246 is moved between the locked position and thelock-released position.

As shown in FIGS. 27A and 28B, the second pack receptacle 210 comprisesan ejector 250. The ejector 250 is used to eject the CD-ROM drive device218 or the floppy disc drive device 219 from the second pack receptacle210. The ejector 250 comprises an operation lever 251 made of syntheticresin. The operation lever 251 has a flat rectangular shape. Thisoperation lever 251 is supported on the bottom wall 5 a of the lowerhousing 5. This bottom wall 5 a has a storage concave portion 252 forstoring the operation lever 251. The storage concave portion 252 is openin the lower surface of the bottom wall 5 a, at a position correspondingto the insertion guide 216. The storage concave portion 252 has an endportion positioned below the relay connector 213. A through-hole 253communicating with the second pack receptacle 210 is open in the endportion of the storage concave portion 252. The opening of thethrough-hole 253 has a shape extending along the relay connector 213.

As shown in FIG. 28B, the operation lever 251 has a pair of bossportions 255 a and 255 b which enter into the through-hole 253. The bossportions 255 a and 255 b are rotatably pivoted on the bottom wall 5 athrough the pivot shaft 256. Therefore, the operation lever 251 isrotatable between a first position where the operation lever 251 entersin the storage concave portion 252 and a second position where theoperation lever 251 projects below the bottom wall 5 a, around the pivotshaft 256 as a fulcrum. Where the operation lever 251 is rotated to besituated at the first position, the operation lever 251 extendscontinuously to the bottom wall 5 a.

As shown in FIGS. 2 and 27A, the storage concave portion 252 has anescape portion 257 for allowing insertion of a finger. The escapeportion 257 is made of a concave having a depth equal to the storageportion 252, and the edge portion 251 a of the operation lever 251opposite to the boss portions 255 a and 255 b faces the escape portion257. Therefore, if the finger is inserted into the escape portion 257,the finger can be hooked on the edge portion 251 a of the operationlever 251, so that the operation lever 251 can be rotated from the firstposition toward the second position.

As shown in FIG. 29A, the operation lever 251 has a stopper wall 258.The stopper wall 258 is formed on the upper surface of the operationlever 251. An engaging groove 259 is formed between the stopper wall 258and the upper surface of the operation lever 251. This engaging groove259 is open toward the side of the operation lever 251. An openingportion 260 is formed in the storage concave portion 252. This openingportion 260 is open in the guide surface 216 a of the insertion guide216. Therefore, if the operation lever 251 is rotated to the firstposition, as shown in FIG. 29A, the stopper wall 258 enters into theopening portion 260, and the engaging groove 259 is exposed to the uppersurface of the bottom wall 5 a.

As shown in FIGS. 27B and 28B, a pair of engaging projections 261 areprovided on the upper surface of the operation lever 251. These engagingprojections 261 are detachably engaged in engaging holes 262 in thebottom surface of the storage concave portion 252 when the operationlever 251 is rotated to the first position. Due to the engagement, theoperation lever 251 is kept at the first position.

As shown in FIGS. 27A and 28B, the boss portions 255 a and 255 b of theoperation lever 251 respectively have pressure parts 265 a and 265 bextending toward the relay connector 213. These pressure parts 265 a and265 b are arranged apart from each other in the lengthwise direction ofthe relay connector 213, between the relay connector 213 and the bottomwall 5 a of the lower housing 5. When the operation lever 251 is rotatedto the first position, the pressure parts 265 a and 265 b are made tostand substantially vertically with respect to the bottom wall 5 a, andpositioned below the relay connector 213. Therefore, the pressure parts265 a and 265 b face the connector mount surface 220 a or 234 a of thedevice 218 or 219, when the CD-ROM drive device 218 or the floppy discdrive device 219 is kept attached to the second pack receptacle 210.

As shown in FIG. 28A, when the operation lever 251 is rotated from thefirst position to the second position, the boss portions 255 a and 255 bare rotated around the axis. The pressure parts 265 a and 265 b fallforward toward the connector mount surface 220 a or 234 a, and theconnector mount surface 220 a or 234 a is pressed in a direction inwhich the surface is released apart from the relay connector 213.Therefore, the CD-ROM drive device 218 or the floppy disc drive device219 is pushed out of the insertion port 212, and the engagement betweenthe relay connector 213 and the CD-ROM connector 231 or the FDDconnector 253 is released. In this case, the length to the edge portion251 a for hooking the finger from the pivot shaft 256 as the rotationcenter of the operation lever 251 is much greater than the length fromthe pivot shaft 256 to the contact portion between the pressure parts265 a and 265 b and the connector mount surface 220 a or 234 a, as isapparent from FIG. 28A.

As shown in FIGS. 21, 24, and 25, a compression coil spring 266 isprovided at the second pack receptacle 210. The compression coil spring266 is supported on an end portion of the holder 215, and is arrangedadjacent to the relay connector 213. This compression coil spring 266 isforcibly compressed between the connector mount surface 220 a or 234 aand the holder 215, when the CD-ROM drive device 218 or the floppy discdrive device 219 is contained in the second pack receptacle 210.Therefore, the CD-ROM drive device 218 or the floppy disc drive device219 is applied with a force by which the device 218 or 219 iscontinuously pressed against the insertion port 212. As a result ofthis, when the operation lever 251 is rotated to the second position andthe CD-ROM drive device 218 or the floppy disc drive device 219 ispushed out of the second pack receptacle 210, the pressure force fromthe compression coil spring 266 is applied thereto.

As shown in FIGS. 21 and 24, the bottom wall 5 a of the lower housing 5facing the second pack receptacle 210 is provided with a link lever 270.This link lever 270 serves to linking the stopper 245 with the ejector250. The link lever 270 has an L-shaped lever body 271 and an armportion 272 connected to the lever body 271.

The bottom wall 5 a has a shaft portion 273. An end of the lever body271 is rotatably pivoted on the bottom wall 5 a by the shaft portion273. The other end of the lever body 271 is introduced to the vicinityof the opening portion 260, penetrating through around the insertionguide 216. A stopper nail portion 274 is formed on the other end portionof the lever body 271. The stopper nail portion 274 enters into theengaging groove 259 of the operation lever 251 and is hooked on thestopper wall 258, when the operation lever 251 is held at the firstposition. Therefore, the lever body 271 is supported on the bottom wall5 a such that the lever body 271 can be rotated between a first positionas shown in FIGS. 24 and 29A where the stopper nail portion 274 entersinto the engaging groove 259 and a second position as shown in FIGS. 25and 29B where the stopper nail portion 274 is released off from theengaging groove 259.

As shown in FIG. 25, the arm portion 272 of the link lever 270 extendsfrom the vicinity of the shaft portion 273 as the rotation center of thelever body 271 toward the slider 246. The top end of the arm portion 272is rotatably connected with the slider 246, thereby linking the slider246 with the lever body 271. Therefore, when the slider 246 is moved tothe locked position, the lever body 271 is rotated to the firstposition. When the slider 246 is slided to the lock-released position,the lever body 271 is rotated to the second position. As a result ofthis, the rotation of the operation lever 251 to the second position isrestricted when the CD-ROM drive device 218 or the floppy disc drivedevice 219 is kept locked in the second pack receptacle 210.

Note that the reference 280 in FIGS. 1 and 21 denotes an AC power sourceadapter which converts a commercial alternating current power sourceinto a direct current power source. This adapter 280 is provided abovethe connector support portion 34 a of the first circuit board 34, and iscontained in the convex portion 22 of the upper housing 6.

In the first embodiment of the present invention as described above, theprocedures for detaching the battery pack 135 from the casing 4 will beexplained.

At first, the casing 2 is lifted up, to make the bottom wall 5 a of thecasing 2 off from, for example, a top board of a desk. In this state,the holding member 185 is pushed up to the second position by theoperation lever 188. Then, the locking claw 186 of the holding member185 leaves the second side wall 173 of the battery cover 170, therebyreleasing the locking of the battery cover 170.

Next, the battery cover 170 is slided toward the right side, with theholding member 185 kept pushed up to the second position. By thussliding the battery cover 170, the second engaging parts 172 a and 172 bas well as the third engaging parts 174 a and 174 b of the battery cover170 are released from the engaging projections 176 a and 176 b as wellas the engaging projections 177 a and 177 b, and simultaneously, thefourth engaging parts 173 a and 173 b of the battery cover 170 arereleased from the stopper nails 178 a and 178 b. As a result of this,the battery cover 170 is detached from the lower housing 5, and thebattery pack 135 contained in the battery container room 104 and thelocking member 150 are exposed to the outside of the casing 2.

In the next, a finger is hooked on the stopper claw 155 at the top endof the locking member 150, to rotate the locking member 150 to thelock-released position. By thus rotating the locking member 150, thestopper claw 155 of the locking member 150 is released off from thecorner portion 136 a of the battery case 136, and the locking of thebattery pack 135 is released. Then, since the second end of the batterycase 136 having the corner portion 136 a is continuously pressed againstthe opening portion 100 a by the compression coil springs 164 a and 164b, the second end of the battery case 136 is forcibly pushed out of thebattery container room 104. Therefore, the battery pack 135 is rotatedaround a fulcrum of a contact position between the battery connector 108and the terminal plates 138, so that the second end jumps out of theopening portion 100 a. As a result of this, an operator can easily catchthe second end of the battery case 136 by hands, so that even a heavybattery pack 135 can be easily pulled out of the battery container room104.

When the battery pack 135 is detached with the computer 1 set up sidedown and with the bottom wall 5 a oriented upwardly, as particularlyshown in FIGS. 2 and 14, the second end of the battery case 136 jumpsupwardly out of the opening portion 100 a, so that the second end of thebattery case 136 can be easily caught by hands. Therefore, it is notnecessary to make a troublesome operation, i.e., to pull out a heavybattery pack 135 from inside the battery container room 104. The batterypack 135 can be easily detached.

In addition, since the battery pack 135 can be rotated around a fulcrumof a contact portion between the battery connector 108 and the terminalplates 138, the connection terminals 109 of the battery connector 108does not rub the terminal plates 138, and an excessive force which wouldact to bend the connection terminals 109 is not applied. Therefore,damages on the battery connector 108 can be prevented.

According to the structure as described above, the locking member 150 ishooked on the battery pack 135, and the battery pack 135 is maintainedin the battery container room 104, when the battery cover 170 is keptdetached from the casing 2. Therefore, even though the battery containerroom 104 is open in the bottom wall 5 a of the lower housing 5, thebattery pack 135 can be prevented from unintentionally falling. In thiscase, since the locking member 150 is adjacent to the battery pack 135,the battery pack 135 can be supported by the hand which issimultaneously used for operating the locking member 150. Therefore,when the locking member 150 is moved to the lock-released positionthereby releasing the locking of the battery pack 135, the battery pack135 is prevented from unintentionally falling, so that the proceduresfor detaching the battery pack 135 from the casing 2 are facilitated.

In addition, when the battery cover 170 is kept attached to the casing2, the cover body 171 of the battery cover 170 is in contact with thebottom surface of the battery case 136, and therefore, the battery pack135 can be supported from the lower side thereof, with use of thebattery cover 170. Therefore, a heavy battery pack 135 can be securelyheld in the battery container room 104 by the locking member 150 and thebattery cover 170.

The battery cover 170 covers and hides the locking member 150.Therefore, as long as the battery cover 170 is not detached, the lockingof the battery pack 135 cannot be released. It is thus possible toprevent the locking of the battery pack 135 from being unintentionallyreleased.

In the computer 1 as described above, the hard-disc drive device 118 isdetached from the hard-disc container room 103, in the followingprocedures. At first, as shown in FIG. 2, the computer 1 is set up sidedown, and the battery cover 170 and the battery pack 135 are detachedfrom the battery container room 104. Then, the battery container room104 is opened, so that the hard-disc drive device 118 is be exposed tothe outside of the casing 2 through the battery container room 104 andthe opening portion 100 a of the lower housing 5.

In the next, the screws 127 are screwed out, to release the connectionbetween the hard-disc drive device 118 and the guide wall 115. Then, afinger is inserted through the opening portion 100 a and the batterycontainer room 104, and the finger is hooked on the stopper portion 125of the hard-disc drive device 118, to slide the hard-disc drive device118 in the direction in which the device 118 is moved away from the harddisc connector 105. By thus sliding the device 118, the engagementbetween the hard-disc connector 105 and the relay connector 120 isreleased, so that the hard-disc drive device 118 can be pulled out ofthe hard-disc container room 103.

In this case, the hard-disc container room 103 and the battery containerroom 104 are disposed in the thickness direction of the casing 2, andtherefore, the hard-disc drive device 118 can be taken out through thebattery container room 104 and the opening portion 100 a of the lowerhousing 5, or inversely, the hard-disc drive device 118 can be insertedinto the hard-disc container room 103. Therefore, it is not necessary toform an opening portion specialized for inserting and taking out thehard-disc drive device 118, and thus, the structure of the casing 2 canbe simplified.

When the hard-disc drive device 118 is kept contained in the hard-disccontainer room 103, the hard-disc drive device 118 is covered by thebattery pack 135 from below. Therefore, any special cover for coveringthe hard-disc drive device 118 is not required, and accordingly, thenumber of components used can be reduced.

In addition, according to the computer 1 described above, the first packreceptacle 100 contains the hard-disc drive device 118 and the batterypack 135, layered in the thickness direction of the casing 2. Therefore,the battery cover 170 need only have a size large enough to cover thebattery pack 135 which is larger than the hard-disc drive device 118.Therefore, the battery cover 170 can be formed in a compact size, anddetaching and attaching services for the battery cover 170 can becarried out with ease.

Further, according to the computer 1 having the structure as describedabove, the flat space occupied by the hard-disc drive device 118 and thebattery pack 135 can be reduced in comparison with a case in which thehard-disc drive device 118 and the battery pack 135 are disposed in thewidth direction of the casing 2. Therefore, it is possible to save aspace for containing the functional components such as the CD-ROM drivedevice 218 and the floppy disc drive device 219, inside the casing 2,without enlarging the flat shape of the casing 2 to be large. Theinternal equipment efficiency of the casing 2 can thus be improved.

Meanwhile, supposing that the floppy disc drive device 219 is attachedto the second pack receptacle 210 in the computer 1 having the structureas described above, the procedures for replacing the floppy disc drivedevice 219 with the CD-ROM drive device 218 will be explained below.

At first, the computer 1 is lifted or set up side down, to expose theoperation lever 248 in the bottom wall 5 a of the casing 2. In the next,the operation lever 248 is operated to slide the slider 246 from thelocked position to the lock-released position. By thus sliding theslider 246, the engaging projection 247 is pulled out of the lockinggroove 229 of the floppy disc drive device 219, and the locking of thefloppy disc drive device 219 is released. Since this slider 246 ismoved, linked with the lever body 271 of the link lever 270, the leverbody 271 is rotated from the first position to the second position whenthe slider 246 is slided to the lock-released position. Therefore, thestopper nail portion 274 leaves the engaging groove 259 of the operationlever 251, thereby releasing the locking of the operation lever 251.

In the next, a finger is inserted into the escape portion 257 of thebottom wall 5 a of the lower housing 5, and the finger is hooked on theedge portion 251 a of the operation lever 251. Then, the operation lever251 is rotated from the first position to the second position. Then, asshown in FIG. 28A, the pressure parts 265 a and 265 b of the operationlever 251 press the connector mount surface 234 a of the floppy discdrive device 219 in the direction in which the connector mount surface234 a is moved away from the relay connector 213. By thus pressing theparts 265 a and 265 b, the FDD connector 235 of the floppy disc drivedevice 219 leaves the relay connector 213, and the floppy disc drivedevice 219 is pushed out of the insertion port 212. At this time, sincethe connector mount surface 234 a of the floppy disc drive device 219 iscontinuously pressed in the direction toward the insertion port 212 bythe compression coil spring 266, this pressure force is added to theforce applied by operating the operation lever 251. Therefore, when theengagement between the FDD connector 235 and the relay connector 213 isreleased, the floppy disc drive device 219 jumps out of the insertionport 212, in response to the pressure force from the the compressioncoil spring 266.

Hence, an operator can catch that portion of the floppy disc drive 219by which this device 219 projects from the insertion port 212, so thatthe floppy disc drive device 219 can easily be pulled out of the secondpack receptacle 210. When the floppy disc drive device 219 is completelydetached, the operation lever 251 is rotated toward the first position,and is stored into the storage concave portion 252 of the bottom wall 5a.

In the next, the CD-ROM drive device 218 is inserted into the secondpack receptacle 210 through the insertion port 212, and the CD-ROMconnector 231 is engaged with the relay connector 213. Due to thisengagement, the CD-ROM drive device 218 is electrically connected to thecomputer 1.

In the next, the operation lever 248 of the stopper 245 is operated toslide the slider 246 to the locked position from the lock-releasedposition. By thus sliding the slider, the engaging projection 247 of theslider 246 is engaged in the locking groove 229 of the casing 220. Inaddition, the lever body 271 of the link lever 270 is rotated from thesecond position to the first position as the slider 246 slides. By thisrotation, the engaging nail portion 274 enters into the engaging groove259 of the operation lever 251, and the operation lever 251 is locked onthe first position. As a result of this, the CD-ROM drive device 218 islocked in the second pack receptacle 210, and thereby, a series ofprocedures for replacing the CD-ROM drive device 218 with the floppydisc drive device 219 are completed.

If the slider 246 of the stopper 245 is slided from the lock-releasedposition to the locked position before the CD-ROM drive device 218 isinserted into the second pack receptacle 210, the stopper wall 228 ofthe casing 220 interferes with the engaging projection 247 of the slider246, when the CD-ROM drive device 218 is inserted into the second packreceptacle 210. In this case, the corner portions of the stopper wall228 and the engaging projection 247, which face each other, respectivelyform slanting surfaces 228 a and 247 a. Therefore, when the slantingsurface 228 a of the stopper wall 228 is brought into contact with theslanting surface 247 a of the engaging projection 247, the slider 246 isapplied with a force by which the slider 246 is pushed in a directionfrom the locked position toward the lock-released position, and theslider 246 is forcibly pushed back to the lock-released position fromthe locked position. Therefore, the engaging projection 247 is movedaway from the stopper wall 228, so that the insertion operation of theCD-ROM drive device 218 is not prevented even if the slider 246 isslided to the locked position when the CD-ROM drive device 218 isinserted into the second pack receptacle 210.

According to the computer 1 having the structure as described above, theoperation lever 251 of the ejector 250 is provided at the bottom wall 5a of the lower housing 5, so that the casing 2 of the computer 1 coversand hides the operation lever 251, when the computer 1 is placed on atop board of a desk. Therefore, when the floppy disc drive device 219 orthe CD-ROM drive device 218 is taken out of the second pack receptacle210, it is necessary to make intentional operations of lifting up thecasing 2 to make the bottom wall 5 a off from the top board of the deskor of setting the casing 2 up side down to keep the computer 1 in acondition in which the operation lever 251 can be operated.

Therefore, it is possible to prevent erroneous operation that anoperation lever 248 or 251 is operated while using the floppy disc drivedevice 219 or the CD-ROM drive device 218, and thus, operation of takingout the floppy disc drive device 219 and the CD-ROM drive device 218from the second pack receptacle 210 can be securely carried out withouterrors.

In addition, since the operation lever 251 is provided at the bottomwall 5 a of the casing 2, the operation lever 251 is positioned adjacentto the floppy disc drive device 219 or CD-ROM drive device 218 in thevertical direction in the casing 2. Therefore, the length from the pivotshaft 256 as a rotation center of the operation lever 251 to the edgeportion 251 a used for hooking a finger is set to be much longer thanthe length from the pivot shaft 256 to the contact portion between thepressure parts 265 a and 265 b and the connector mount surface 220 a or234 a. Consequently, when the operation lever 251 is rotated from thefirst position toward the second position, the rotation force of theoperation lever 251 is amplified by the ratio between the two lengthsdescribed above, and is transmitted to the connector mount surface 220 aor 234 a. As a result of this, the pressure force applied to theconnector mount surface 220 a or 234 a through the pressure parts 265 aand 265 b is increased to be large enough to exceed the engagement forcebetween the relay connector 213 and the FDD connector 235 or the CD-ROMconnector 231. Therefore, when the floppy disc drive device 219 or theCD-ROM drive device 218 is pushed out of the second pack receptacle 210,the operation lever 251 can be easily operated with a small force, sothat the floppy disc drive device 219 or the CD-ROM drive device 218 canbe easily detached.

In addition, according to the structure as described above, the pressureparts 265 a and 265 b of the operation lever 251 are arranged adjacentto the relay connector 213, and also presses the connector mount surface220 a or 234 a at two positions which are arranged apart from each otherin the lengthwise direction of the relay connector 213. Therefore, thefloppy disc drive device 219 or CD-ROM drive device 218 is linearlypushed out toward the insertion port 212 without being leaned.Accordingly, any unreasonable force which would wrench the engagementportion between the relay connector 213 and the FDD connector 235 orCD-ROM connector 231 is not applied thereto. As a result of this,damages on the connectors 214, 235, and 231 can be prevented, and thefloppy disc drive device 219 or the CD-ROM drive device 218 can besmoothly pushed out.

Further, according to the structure as described above, when theengaging projection 247 of the stopper 245 is kept engaged in thelocking groove 229 of the floppy disc drive device 219 or the CD-ROMdrive device 218, the stopper nail portion 274 is hooked on theoperation lever 251 of the ejector 250, thereby locking the operationlever 251 on the first position. Therefore, even if an operator shoulderroneously try to rotate the operation lever 251 from the firstposition to the second position while the floppy disc drive device 219or the CD-ROM drive device 218 is locked in the second pack receptacle210, the stopper nail portion 274 prevents the rotation lever 251 frombeing rotated. Hence, an operator will find that the floppy disc drivedevice 219 or the CD-ROM drive device 218 is locked in the second packreceptacle 210, and thus, it is possible to prevent erroneous operationof forcibly pushing out the floppy disc drive device 219 or the CD-ROMdrive device 218 from the second pack receptacle 210. Therefore, damageson the ejector 250 and the stopper 245 can be prevented.

Note that the present invention is not limited to the first embodimentdescribed above. FIG. 30 shows a second embodiment of the presentinvention. This second embodiment is different from the first embodimentmainly in the structure of a battery pack and the structure for lockingthe battery pack in a battery container room, and the other pointsconcerning the structure of the second embodiment are the same as thoseof the first embodiment. Therefore, those portions of the secondembodiment which are the same as those of the first embodiment will bedenoted at the same reference symbols, and explanation of those portionswill be omitted herefrom.

As shown in FIG. 30, the battery case 136 of the battery pack 135integrally compresses a cover portion 300 for opening and closing theoperating portion 100 a of the lower housing 5. The cover portion 300 isarranged such that the cover portion 300 is detachably hooked on thelower housing 5 when slided together with the battery pack 135 towardthe battery connector 108. This cover portion 300 is held in the lowerhousing 5 by the holding member 185. Therefore, the battery pack 135 isalso held in the battery container room 104 by the holding member 185,and this holding member 185 serves to lock the battery pack 135.

According to the second embodiment having the structure as describedabove, since the battery pack 135 and the cover portion 300 are lockedin the lower housing 5 by on single holding member 185, any specialmechanism for locking the battery pack 135 is not required. Therefore,the number of components can be reduced, and the manufacturing costs forthe computer 1 can also be reduced.

Additional advantages and modifications will readily occur to thoseskilled in the art. Therefore, the invention in its broader aspects isnot limited to the specific details, and representative devices shownand described herein. Accordingly, various modifications may be madewithout departing from the spirit or scope of the general inventiveconcept as defined by the appended claims and their equivalents.

What is claimed is:
 1. An electronic apparatus comprising: a casinghaving an opening; a receptacle provided in the casing; a disk driveunit inserted through the opening and detachably stored in thereceptacle; and a battery pack inserted through the opening, detachablystored in the receptacle, and positioned on the disk drive unit.
 2. Anelectronic apparatus according to claim 1, further comprising adetachable cover which covers the opening.
 3. An electronic apparatusaccording to claim 1, wherein said battery pack covers the disk driveunit from an opening side.
 4. An electronic apparatus according to claim1, wherein said disk drive unit and the battery pack are stacked one ontop of the other in the thickness direction of the casing in thereceptacle.
 5. An electronic apparatus according to claim 1, whereinsaid receptacle has a first section for storing the disk drive unit, anda second section for storing the battery pack, the first and secondsections communicating with each other.
 6. A portable electronicapparatus comprising: a box-like casing including a horizontalperipheral wall having an opening portion; a pack receptacle definedwithin the casing and communicating with the opening portion; a packagedfirst functional component stored in the pack receptacle such that thefirst functional component can be detached through the opening portion;and a packaged second functional component stored in the packreceptacle, covering the first functional component in a direction fromthe opening portion, such that the second functional component can bedetached through the opening portion, said first and second functionalcomponents are layered on each other in the thickness direction of thecasing in the pack receptacle.
 7. A portable electronic apparatusaccording to claim 6, wherein the pack receptacle has a first sectionfor storing the first functional component, and a second section forstoring the second functional component, the first and second sectionscommunicate with each other, and the first section has an area smallerthan the second section.
 8. A portable electronic apparatus according toclaim 7, wherein the first functional component has a flat plate-likebracket fixed to the first section by a screw, and the bracket isexposed to the second section and serves as a wall for receiving thesecond functional component.
 9. A portable electronic apparatusaccording to claim 7, further comprising locking means provided in thesecond section, for holding the second functional component in thesecond section, said locking means being movable by manual operationbetween a locked position where the locking means is hooked on thesecond functional component and a lock-released position where thelocking means leaves the second functional component.
 10. A portableelectronic apparatus according to claim 9, further comprising: a coverdetachably supported on the casing, for covering the opening portion andthe locking means; and holding means for holding the cover on thecasing, said holding means being movable by manual operation between afirst position where the holding means is engaged with the cover and asecond position where the holding means leaves the cover.
 11. A portableelectronic apparatus according to claim 9, wherein the second sectionhas a first connector, and the second functional component has a firstend having a second connector which is connected with the firstconnector when the second functional component is stored in the secondsection, and a second end positioned opposite to the first end, on whichthe locking means is hooked.
 12. A portable electronic apparatusaccording to claim 6, wherein the first and second functional componentsrespectively have opposing surfaces which face each other when the firstand second functional components are stored in the pack receptacle, andone of the opposing surfaces of the functional components is providedwith a concave portion while the other of the opposing surfaces isprovided with a convex portion which enters into the concave portion.